Ink compositions containing lanthanide complexes
US7108742B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2003 |
| Grant date | Sep 19, 2006 |
| Priority date | — |
| Expiry date | Feb 18, 2023 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06P5/30
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The invention relates to an ink composition containing (a) a compound of formula (I), Lm−Ln3+(Ch−)n (I), wherein Ln represents a lanthanide, CH− is a negatively charged ligand containing at least one UV absorbing double bond, n denotes 3 or 4, m denotes a number from 1 to 4, in case n is 3, m denotes a number from 1 to 4 and L is a neutral monodentate or polydentate nitrogen-, oxygen- or sulfur-containing UV absorbing ligand with the exception of 2,2′-bipyridyl or, in case n is 4, m denotes 1 and L is a single-charged cation; and (b) a liquid ink carrier, which can be used for applying hidden mark on objects which can only be revealed under UV exposure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.